Plaster cast cutter



Sept. 6, 1932. L. A. MEAD 1,876,337

PLASTER CAST CUTTER Filed Nov. 25, 1951 2 Sheets-Sheet l ii-.1 --i IN VEN TOR.

P 6, 1932- A. MEAD PLASTER CAST CUTTER Filed Nov. 25, 1951 2 Sheets-Sheet 2 INVENTOR. QVg QJ 10 having shaft extensions 11 and 12 at its Patented Sept. 6, 1632 UNITED y Application filed. l lo.

v This invention is a plaster is adapted to the particular purposefofres. moving -p1aster..ca'sts quickly andhwithout' dange r inconvenience to the atig The main objectof the invent1on i sto pro-f g a I housing 15';

vide means for cutting plaster castsfto' rinit their removal from the injured mem of the patient.

Another object of the invention vide the means I outlined with suitable safety guards to protect the patient from injury .by the cutting elements. g A further bje'ctof the invention is-tozprovide the meansoutlined with means for .co1-

lecting any small fraigmentsordufiiormedf,

during the: cuttingoperation preferablyjby v themtalsepipeflt'th vacuum-means;g

Other objects: and advantages of the finvention will become apparent as thefollow: ing description isi'readjon the drawings form ing apart o f-this s 'ecificationandin which similar reference c aracters are u'sed tojin-' -dicate similar j arts throughout 'viewsandinw ich z a 1 a 1 .Fig. 1 is a plan view of the invention.

' Fi '2 is a side elevation'showing'the saw guar swung forward to permit-chang ng ofs'aws. I Fig. 3 is a bottom view of the invention.

Fig; 4 isan enlarged rear elevationof the fan and housing .with cover removed. Fig. 5 is an enlarged inside'view of'the fan housing cover.

the several Fig; 5 and showing the connection to the housing Fig. 4.1- I

Fi 7 is an enlarged section taken on line .7- 7ofFig.1. Y I Fig. '8 is a plan view of the guard finger. The invention consists of an electric motor opposite ends, a bracket 13 being removably secured tothe' front end of the motor and having-an integral gear housing 15 which is 20 and 21 and has fixedly secured thereto, a

: t 'b ee l d; :11- and is rotatably in bearin j An' arm 29; is1integ'r 1 with housing slsndhaspivotally. mounted thereon, 30, a-guard 5 Pivoeu secured at I 401% backers; 41*

which are integral; with thejmotor housing r .is a; combination stop guardnnd feele 42 clear the saw 27 and with shoulders 44 adapt- 7 Fig. 6 is a section taken on-of divided on the center line 16'and secured 7' and "26 which 31- which covers 'the? upper, portion of the "saw-27, bei ll'g'normfil y d pdsed in the -pos i-; 'tion shown by dottedglines 32'; and swingable to the positionfshown atiBl forreinovalo'r replacementjofsaws. yh slot 33 fit'saboutlowerl portion of which is e a ly' ii l sn fl e fionti' sil tclearthesawjasj iiidicated'f-at'i35;

slidably {and} i'ad'ustab1y} secured it; at

bracketlextension iifijby mefi slof. a screw 37 :is' a depth gauge 38, a -sldt5j39 permittinga'dfli'sustment ofithe gg'augei substantially to the v otto mfof the saw27. l

whichis provided" .with a slot 43,a'd apted to .ed to cooperatelwith' brackets 41,"prevent1ng cooperation of the, saw 27 {with the bottom of slot 43 by;Zlimitingthe-movement of the' guard in one direction." The guard is free to swing injthe other direction and; is resiliently retained in theposition-shown inFigs. 2 and? bv the spring45. -'I he re ar'ward por- 'tion on e guard is .brought'to' inverted v. form toact as .a sp'reader forlthe out,

The exhausterf consists; of an 1' impeller which is formed of a plurality 0f pairs. of

'curved blades 46.1which are secured to a-flfiF-ii ted hub 47 by means of an integral. crO S-f member 48 and screws 49,.the ;h 11b 47 removably secured to shaft extension--12 on. motor 10. The exhauster -h0l'1sing"'50 is' removablj secured .to the motor 10 the interior of the casing being of the usual scroll forin" 51 and y an opening 52 permitting removal of the impeller, the scroll terminating ina pocket'53 l Removahly; bearin '26a-1circular saw 271 which which has a forwardly extending outlet 54 to which a bag 55 formed of fine mesh flexible'material is removably secured, as by an elastic collar .56, the bag having restraining members 57 connecting the upper and lower walls to retain the bag substantially fiat. A suitable hook and ring 58 are provided for securing the'forward end of the bag.

An intake port 59 is provided with means,

such as a taper joint, for removably securing the intake pipe 34.

The fan housin cover 60 is provided with an integral mani old 61 having an opening 62 adapted to register with the port 59 in housing 50 and a fan intake 0 em'ng 63 which is centrally disposed relative tothe impeller. r

A pistol grip 64 is preferably formed integral with cover 60 and is provided with a trigger switch 65 for control of current to the motor 10 through wires or cord 66 the wires extending to the motor through apertures 67 and 68 in the housing 50 and cover. 60, the aperture 68 opening into the member 69 of the handle. A gasket 70 forms a tight joint between the housing and cover 60, the housing and cover being secured together and to the motor by means of screws passing through apertures 71 in the cover and 72 in housing '50.

In operation, the feeler 42 is passed inside the cast 73 and by drawing back on the trigger 65, the motor is cut mto circuit, coincidently driving the saw 27 and impeller 46.

35 The saw 27 cuts through the cast 73 and the feeler 42 protects the patient from injury as it is impossible for the saw to pass through, due to the stop 44, the rearward portionof the feeler 42 spreadin the cut as the saw is advanced. The dust ormed by the saw is drawn through pi e 34, thence through port 59 and manifol 61 throu h the opening 63 and discharged through t e pocket 58 and outlet 54 into ag 55 which retains all dust as is usual with vacuum cleaner bags, and being formed of similar material.

Release of the trig er stops the saw and fan, therefore the evice is under instant control.

The ard 38 is intended to be used where said motor and havlng'an integral gear box a saw rotatabl mounted on one side of said Y I the fee er 42 cannot be used and is to be adjusted carefully for depth to prevent cutting too deep. aving described an operable method of constructing and using the invention it will be noted that variations in construction and arrangement of parts which are consistent with the appended claim may be resorted to without detracting from the spirit or scope of the invention or sacrificing any of the advantages thereof. I claim: 4 A plaster cast cutter comprising an electric motor, a bracket secure to the front of 

